yisrael012332
  • yisrael012332
Evaluate the following expression using the values given: Find 4x - y - 2z if x = -2, y = 3, and z = -2 HELP HELP HELP
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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yisrael012332
  • yisrael012332
@ganeshie8
yisrael012332
  • yisrael012332
@Hero
yisrael012332
  • yisrael012332
@HWBUSTER00

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yisrael012332
  • yisrael012332
@dan815
yisrael012332
  • yisrael012332
@dan815
yisrael012332
  • yisrael012332
@princeharryyy
yisrael012332
  • yisrael012332
@PrinceKel
yisrael012332
  • yisrael012332
@Michele_Laino
yisrael012332
  • yisrael012332
@Nnesha
anonymous
  • anonymous
Just substitute the numbers given to you into the equation.
anonymous
  • anonymous
\[4(-2)-(3)-2(-2)\]
yisrael012332
  • yisrael012332
TY IS -7
yisrael012332
  • yisrael012332
ITs##
yisrael012332
  • yisrael012332
can you help with another
yisrael012332
  • yisrael012332
The radius of a cone-shaped tank is 4 feet less than its height. If the height of the tank is (x - 3) feet, the expression below shows the volume of the tank: 1 over 3π(x - 7)2 (x - 3) What does the factor π (x - 7)2 represent?
yisrael012332
  • yisrael012332
u have no clue'
yisrael012332
  • yisrael012332
i
DanJS
  • DanJS
Radius is 4 less than the height... write that as it reads, 'is' means equals r = h - 4
DanJS
  • DanJS
Height is (x-3) h = x - 3
yisrael012332
  • yisrael012332
The total surface area of the tank The area of the curved sides of the tank The area of the circular base of the tank The area of the base of about three such tanks
yisrael012332
  • yisrael012332
so would it be the 3ed one
DanJS
  • DanJS
The volume of a Cone is \[V = \frac{ 1 }{ 3 }\pi*r^2*h\]
princeharryyy
  • princeharryyy
insert in the values and solve
DanJS
  • DanJS
The radius is measured from the wide base of the cone
yisrael012332
  • yisrael012332
oh ok so d
DanJS
  • DanJS
If the radius is height minus 4 and the height is x - 3 r = h - 4 h = x - 3 sub in h for the radius r = (x-3) - 4 = x - 7
DanJS
  • DanJS
They want to know what pi*(x-7)^2 represents... in other words now that you have r = x - 7 the question is , what is pi*r^2
yisrael012332
  • yisrael012332
you lost me
DanJS
  • DanJS
ok, the givens in the problem are, r = h -4 (radius is 4 less than height) h = x - 3 (height is x - 3
DanJS
  • DanJS
you get that part?
yisrael012332
  • yisrael012332
yea
DanJS
  • DanJS
To combine those two, you can take the h = x - 3, and insert that into the radius r = h - 4 = (x-3) - 4 r = x - 7 so the radius is in terms of X now, not the height
DanJS
  • DanJS
good?
yisrael012332
  • yisrael012332
no
DanJS
  • DanJS
The radius is given in terms of the height of the cone... the height is given in terms of a measurememt X... is is one of those compound functions like.. r [ h(x)] You use the height value in the radius , to get r(x), the radius in terms of the measure X instead of height h
yisrael012332
  • yisrael012332
i understand but What does the factor π (x - 7)2 represent
yisrael012332
  • yisrael012332
i understand how you solved it but how doo i answer the question
DanJS
  • DanJS
The volume of a cone is \[V = \frac{ 1 }{ 3 }\pi*r^2*h\]
DanJS
  • DanJS
recall, the area of a circle is A = pi*r^2 So the Volume of the cone is, 1/3 * ( area of circle base) * (height)
yisrael012332
  • yisrael012332
yea ok
DanJS
  • DanJS
pi times the radius squared is the area of the base in this instance
yisrael012332
  • yisrael012332
so its c
yisrael012332
  • yisrael012332
like i said
DanJS
  • DanJS
\[V = \frac{ 1 }{ 3 }\pi*r^2*h = (area ~base)*\frac{ height }{ 3 }\]
DanJS
  • DanJS
i didnt look at the answers
yisrael012332
  • yisrael012332
The total surface area of the tank The area of the curved sides of the tank The area of the circular base of the tank The area of the base of about three such tanks
yisrael012332
  • yisrael012332
i understand the problem no but i wanted to clarify
DanJS
  • DanJS
a, right on, yeah C
yisrael012332
  • yisrael012332
tytytytytyty so much

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